Alpinestars Protector Nuc Kr-3Highly flexible and breathable, the Alpinestars Nucleon KR 3 Back Protector is engineered for maximum performance. Using hard shell backed with a soft viscoelastic PU foam compound, the KR3 achieves both max comfort and extraordinary impact absorption. 3 waist to shoulder dimensions in order to cover all body sizes Lattice structured back shell plate constructed from a high performance polymeric material blend for optimized flexibility and excellent